LOL, good point...
A steel flywheel would definitely help out some. Depending on what kind of power he's making, a clutch that doesn't chatter or grab instantly would also make driving much easier.
If he's running an 800 series clutch disc, it might be more prone to chattering because of the Kevlar pucks. When they get hot, they tend to chatter. However, if you have 600 hp, there's not much you can do in the way of holding the power and making it feel like a VW. You either go to a McLeod twin disc, go with an organic disc and wait for it to slip, or just deal with it and play with the big boys.
The good thing about hydraulic clutches is that you fine tune them a little bit. If you could get away with using a less radical disc paired with a high clamping force pressure plate, then you could swap clutch master cylinders to get the pedal effort down. There's lots of ways of getting around things.